Ratio type galvanometer



y 1 c. M. HATHAWAY 2,605,303

RATIO TYPE GALVANOMETER Filed Sept. 14, 1950 Patented July 29, 1952UNITED STATES PATENT OFFICE Application September 14, 1950, Serial No.184,867

4 Claims.

The present invention relates to a galvanometer element, and moreparticularly to one which will deflect in proportion to the ratio of twocurrents.

In a number of instances where oscillographs are employed, as in thecase of radio telemetering, it has been found desirable to provide anindication of the ratio of two currents. To conveniently provide suchindication it would be desirable to have an oscillograph galvanometerwhich will deflect in proportion to the ratio of two cur rents.

Therefore, it is an object of the present invention to provide animproved ratio type galvanorneter.

Still another object of the present invention is to provide a movingcoil galvanometer element which will deflect in accordance with theratio of two currents.

Other and further objects of the present invention subsequently willbecome apparent by reference to the following description taken inconjunction with the accompanying drawing, where- Figure 1 is anenlarged plan view of a portion of a galvanometer element constructed inaccordance with the present invention;

Figure 2 is a side view of the element shown in Figure 1;

Figure 3 is a plan view of a galvanometer element and support therefor;and

Figure 4 is a side view of the device shown in Figure 3.

Referring to the drawing there is shown a galvanometer element having acoil H, which is arranged at right angles to a second coil l2. The coilI2 is carried by two spools l3 and I4 placed inwardly a short distancefrom two similar spools I5 and is, which support the coil H. Mounted onthe coil ll is a reflecting mirror I! which is secured thereto bysuitable cement. One terminal of the coil H is connected to a wire 2|which engages a lug carried by the spool l5. The other terminal of thecoil 1 l is connected to a wire l9, which engages a lug carried by thespool IE. One terminal of the coil [2 is also connected to the wire 2|.The other terminal of the coil I2 is wound in a helical manner to form ashort coil I8 surrounding that portion of the wire I9, which is close tothe spool 16.

A suitable support plate 22 is provided with a plurality of mountingholes 23. The plate 22 carries a post 24, which is insulated therefromand which is connected to a binding post 25. Another post 26 is alsoinsulated from the plate 22 and connected to another binding post 21.

One end of the wire I9 is connected to the post 24. One end of the coilIB is connected to the post 25. The other wire 2| is connected to asupport 28 carried by an adjusting mechanism 29 contained within ahousing 3|, which is provided with a removable cap 32 to give access tothe adjusting mechanism.

For the sake of illustrating the construction certain exaggerations havebeen indulged in since in actual practice each coil is about inch wideand about inch long. In the manufacture of these elements the twowindings II and I2 are each wound separately on their respective metalspools, and then the winding I2 is mounted within the winding II andcemented into position. The element and support therefor, shown inFigure 4, is then mounted on a suitable housing, which is carried by apermanent magnet, which provides a concentrated magnetic gap about .050inch wide.

While for the purpose of describing the present invention a certainpreferred construction has been illustrated in the drawing, it is to beunderstood that such variations are contemplated as may be commensuratewith the spirit and scope of the invention set forth in the accompanyingclaims.

I claim:

1. A galvanometer element mounted between two supports comprising a pairof parallel spools having a winding thereon, said spools being connectedto said supports by fine metallic ribbons, a second pair of parallelspools mounted at right angles to said first spools and having theirends contacting said first winding, said latter spools having anotherwinding thereon substantially filling the central space of said firstwinding, one terminal of which is connected to one of said ribbons, theother terminal being connected to a conductor wound for a short distanceabout the other ribbon.

2. A galvanometer element mounted between two supports comprising a pairof parallel spools carrying a winding therebetween, said spools beingconnected to said supports by line metal wires, said winding beingconductively connected to said wires, a second pair of parallel spoolshaving a winding therebetween and being mounted at right angles to saidfirst winding, said latter spools and winding being supported by andcemented to said first winding and substantially filling the centralspace thereof.

3. The combination comprising a support plate having two supportsinsulated from each other, an insulated binding post, a pair of parallelspools 4. The combination comprising a support plate having two supportsinsulated from each: other, an insulated binding post, a pair ofparallel spools having a winding thereon, each spool: having a supportlug, a plurality of metallic ribbons interconnecting each lug with oneof said supports,

a second pair of parallel spools having a winding? thereon, said latterspools and said winding sub- 4 stantially filling the central spacewithin said first winding and being cemented into position within saidfirst winding with said latter spools at right angles to said firstspools, said first winding being connected to said ribbons, said secondwinding being connected to one of said ribbons, and a connection fromsaid binding post to said latter winding including a winding extendingabout one of said ribbons.

' CLAUDE M. HA-THAWAY.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 2;05'T,845- Pattee Oct. 20, 19362,507,301 Fulbright May 9, 1950 20 2,519,591 Morrow -7 Aug. 22, 1950

